As a visitor to the secure website site, there is a little bit of security stuff required... Please follow the steps, is harder than it looks.

You must verify your identity with a PIN. 

After that, you can collaborate on the shared file or folder for 7 days.

If you need to collaborate longer, you can use the link from the original sharing email to verify your identity again.

PROCEDURE:

In your email inbox, open the email from Google.

Click Open.

Click Send.

In your email inbox, open the verification code email.

Copy the verification code.

Return to the other browser tab and enter the verification code in the box provided.

Click Next.

You can now view the website and the System Formats and Marketing & Selling Plans within it.